roberts



F. T. ROBERTS.

BUMPER.-

.APLlcATmN man ocT. so. 1914.

Patented Aug.v 22,

2 SHEETS-SHEET 1V.

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@es 'Mes erases To all '2v/'windt may concern:

zleit,fknowngtliat L, Fimo THOMAS Ro- ERTSfn .citizen of the United States, residqifngatentonpinthe county of Mercer and tain new. l. and. 5 a useful Improvement in Bumpers, of which the following is a full,

.fcleanfiindexact description, reference be# 1111,95 had, vtozthe accompanying drawings..

ffif 'lheobjeet ofthis invention is to provide very-.resilient and at the -saine time dural:ble-1 lrubber .'buiiiper.

vThe bumper is Well adapted for use on v'elri'cles; ,f or. iexample, automobiles. Its `Characteristics enabling it to produce the desired-.results--in practiceas Well` as to be .cheaply manufactured are hereinafter more LullyeXplained and are summarized in the hCililmi g 'the drawings, Figure 1 is a side eleva- .,.tion ,ofthe portion of a vehicle equipped `'withfone; ,ofg my'. bumpersbetween a semi- 'llipjtiealffsprin'g and the fra-me carrying the .saiifiegfffliggf.;.SZ.isI a cross section on the line of-{f tivo eoperatingparts of' the inoldI for making half sectionsof the bumper; Fig. 5

.,isanenlarged cross section on the line. 5-5

of such two-part mold; Fig. 6 is a plan of onefmemb? O'QWO- part holder for hold- ?.lingfpaiis oi suoli bumper sections as are @produced .by the i-nold of Figs. 3, Je and 5;

YFiggfl is a.vertic`a=l sec-tion ola suitable ap- ;paratusiojr bringing together two coactiin.,y vholdersof` the form shown in Fig. 6 Within a chamber containing' compressed air;Fig.

@Sis -aideelevation of. a somewhat modified .orm= of, my bumper adapted for installation mately triangular or segmental forni shown and may conveniently be provided with three slots 12 and 13 extendingl through solid parts of the bumper. Through these slots pass suitable straps 15 andl by which the bumper is secured inplace'. As shown, the straps 15 pass around the chassis frame member 17 While the strap 16 passes around a suitable plate 18 held by the shackles 19 QFTRNT'GMNEWJ .R Being comentamos CLEVELAND,

Specification of Letters Patent.

Statevro Neuvdersey, have invented a cer-v EnsEY, ASSIGNOR rrol 'rire raRAivioUNr OHIO, A CORPORATION or omo.

BuMrnR.

Patented Aug. 22, 1911.6.

Application led October 30, 1914. Serial No. 869,365.

which hold theleaves 20 of the spring to the axle 21.

Fig. 8 shows, at l25, a bumper operating under -the same principle but having a slightly modified form'. This bumper has the 4closed cavities 26 containing compressed fluid and has through its solid portion slots 24 through which pass straps 27 for holding it in place. Two'of these straps are shown as passing around the rear tubular axle 28 While the other strap passes over the spring and its support. The lower face of this bumper is concaved to make it lit closer over the differential casing 29.

It is to be understood that 'the tivo forms' of bumper shown are to be taken as illustrations of various modifications Oli' shape which may be made according to the re` quireinents of use.

Figs. 3 to 7 inclusive illustrate means for .making the bumper, and, in the specific form shown are adapted for making the bumper of Figs. 1 and 2, but modifications of shape enable similar means .to produce bumpers of other forms, as will be Well understood.

. Referring to Figs', 4 and 5, 30 indicates a mold plate -or block having a cavity 31 witha flat bottoni and a Wall conforming to the contour desired for the bumper. liisin from the base of the cavity are projecting lugs designed to-make the slots for the straps. indicates the cooperating mold plate which is adapted to lie against the face of the `block 30 and has a series of projecting pegs or pins 36 which are adapted to occupy the cavity l31 but do not reach' the bottom thereof.A Fig'. 5 shows the blocks 3() and 35 in coperating position The lugs 32, it Will be seen, reach from the base of the cavity4 31 to the inner face ofl the plate 35, While the pins 36 leave a clear space beneath them and above thebase of the cavity 31. .A'suitable registrationrot' these two -niold parts may be cilected by providing one of them with doWel pins 37 and the other with corresponding holes 38 ln operatingl the mold just described, a piece ot' soft rubber is placed in the cavity 3l and the plate 35 is pressed against the block 30, thus pressing the rubber into the available space between the blocks. This produces a half section of the bumper having one closed side and the otherside provided Wth anumber of open cavities made by the pegs 36. Two oiI s uch halfsections..

are'then secured togetherin an atmosphere of compressed i'iuid, w'he'eby. the iinished "nl neer produced wit i'jgthe entrapped iiuid. 'i

Figs. 6 and 7 illustrate' means for bring'- ing1 the bumper scetiond'together in an atmosphere oi compressed fluid. is shown, si() indicates a suitable chamber. provided witira cover il which may be secured thereto. in' air-tight manner by 'bolts 4t2. i3 indicates a pipe adapted to conduct compressed air 'to the :chamber under the control ota cock ai.' This cock may be provided with .a discharge opening, Li5 to release the air pressure within the elni'mber when the handie of thecoclr is turned transversely. Rotatably inoiinted in the' cap i oi the chainber is. a soclzet vvrenehO shownv as provided' with a hand wheel 5l and extending .through astufiingfhox 52.'

berdescribed is adaptedto contain a pair oit platesfor' holders 60,.,and3i which have cavitiesorbumper sections and are shown as provided with a screw 63,

The' cham whereby the-,plates may be drawn together and held in such position. For the specific j; bumpers shown I have arranged plates as shown in Fig. 6, whe-rein the plate has four cavities 65 arranged about a center and the ,screw occupies a threaded opernng SG at the center. The nlateiOl shown in Fig. 6 is provided with dowel pins 67 which occupy openings in' the plate' G1. The plate G1 is similar to the plate 60 except that the een? trai hole thereof is not screw threaded. The screw 63 may be held to the` plate 6l by means of a collar 68 o n the screw held in a cavity of the plate by a small clamping plate 69. The screw has an angularshanl; 'Z0 which slidably engages the socketv'l at the lower end of thevrench 50. ,I

in operating the apparatus shown in Figs. G and 'l the semi-cured half sections of the bumpers are placed in the cavities G5 with their solid faces at the base of the cavities. Ciment is placed onth'e other face of the bumper section around the open cavities therein and the two plates containing such parts somewhat separatedare placed in the compression chamber 40. rihis fluid under pressure, prei'e ably compressed air, is admitted through a pipe 43, and, while this airpressure is maintained, the hand .that the bumper of this invention may be very cheaply niainifactiued. lilhen completed it ,is extremely elastic by reason of the air pressure; at the lsame time it is very durable. T he portions 'oi the rubber between the.y individual openings constitute cross ties from one side oi the'bumper to the other, giving it the necessary strength. At the Sametime, by makingr a series of individual cavities the durabilityT is increased, because wear or damage which opens a iew only of the cavities would not seriously interiere with the operation of the bumper.

,as showinrthe bumper is secured in use atits opposite edges so that it resists both the strain tending to compress the bumper and the strain tending to stretch it, and it thus acts as an effective shock absorber for either direction of movement. By reason of the fact that the cavities are iilied 'with air under pressure above the atmosphere, this air, rather than the rubber, supports the load and takesv the shoclgand thus the desired elasticity is provided in a bumper which is strong and durable.

Having' thus described my invention, what i claim is:

As a new article of manufacture, abumper comprising a substantially parallel sided block of rubber having in it a large number of transverse parallel cavities, each entirely inclosed by the rubber itself, and 'fluid under greater pressure than the atmospheric pressure in each oit said cavities.

in testimony whereof, l hereunto ailix 'my signature in the presence of two witnesses.

vFenu Trini-nisl noennrs.

litnesses:

vina F. SMiTH,

Herinner R. Sriniuss. 

